diff options
Diffstat (limited to 'lisp/term/tty-colors.el')
| -rw-r--r-- | lisp/term/tty-colors.el | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/lisp/term/tty-colors.el b/lisp/term/tty-colors.el index 252a4301295..9cfe30a4630 100644 --- a/lisp/term/tty-colors.el +++ b/lisp/term/tty-colors.el @@ -824,6 +824,15 @@ A canonicalized color name is all-lower case, with any blanks removed." (replace-regexp-in-string " +" "" (downcase color)) color))) +(defun tty-color-24bit (rgb) + "Return pixel value on 24-bit terminals. Return nil if RGB is +nil or not on 24-bit terminal." + (when (and rgb (= (display-color-cells) 16777216)) + (let ((r (lsh (car rgb) -8)) + (g (lsh (cadr rgb) -8)) + (b (lsh (nth 2 rgb) -8))) + (logior (lsh r 16) (lsh g 8) b)))) + (defun tty-color-define (name index &optional rgb frame) "Specify a tty color by its NAME, terminal INDEX and RGB values. NAME is a string, INDEX is typically a small integer used to send to @@ -840,7 +849,10 @@ If FRAME is not specified or is nil, it defaults to the selected frame." (and rgb (or (not (listp rgb)) (/= (length rgb) 3)))) (error "Invalid specification for tty color \"%s\"" name)) (tty-modify-color-alist - (append (list (tty-color-canonicalize name) index) rgb) frame)) + (append (list (tty-color-canonicalize name) + (or (tty-color-24bit rgb) index)) + rgb) + frame)) (defun tty-color-clear (&optional _frame) "Clear the list of supported tty colors for frame FRAME. @@ -1013,7 +1025,10 @@ might need to be approximated if it is not supported directly." (let ((color (tty-color-canonicalize color))) (or (assoc color (tty-color-alist frame)) (let ((rgb (tty-color-standard-values color))) - (and rgb (tty-color-approximate rgb frame))))))) + (and rgb + (let ((pixel (tty-color-24bit rgb))) + (or (and pixel (cons color (cons pixel rgb))) + (tty-color-approximate rgb frame))))))))) (defun tty-color-gray-shades (&optional display) "Return the number of gray colors supported by DISPLAY's terminal. |